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/*
Copyright (c) 2008-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "glusterfs.h"
#include "xlator.h"
#include "dht-common.h"
int
dht_selfheal_dir_finish (call_frame_t *frame, xlator_t *this, int ret)
{
dht_local_t *local = NULL;
local = frame->local;
local->selfheal.dir_cbk (frame, NULL, frame->this, ret,
local->op_errno);
return 0;
}
int
dht_selfheal_dir_xattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno)
{
dht_local_t *local = NULL;
call_frame_t *prev = NULL;
xlator_t *subvol = NULL;
int i = 0;
dht_layout_t *layout = NULL;
int err = 0;
int this_call_cnt = 0;
local = frame->local;
layout = local->selfheal.layout;
prev = cookie;
subvol = prev->this;
if (op_ret == 0)
err = 0;
else
err = op_errno;
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].xlator == subvol) {
layout->list[i].err = err;
break;
}
}
this_call_cnt = dht_frame_return (frame);
if (is_last_call (this_call_cnt)) {
dht_selfheal_dir_finish (frame, this, 0);
}
return 0;
}
int
dht_selfheal_dir_xattr_persubvol (call_frame_t *frame, loc_t *loc,
dht_layout_t *layout, int i)
{
xlator_t *subvol = NULL;
dict_t *xattr = NULL;
int ret = 0;
xlator_t *this = NULL;
int32_t *disk_layout = NULL;
subvol = layout->list[i].xlator;
this = frame->this;
xattr = get_new_dict ();
if (!xattr) {
gf_log (this->name, GF_LOG_ERROR,
"memory allocation failed :(");
goto err;
}
ret = dht_disk_layout_extract (this, layout, i, &disk_layout);
if (ret == -1) {
gf_log (this->name, GF_LOG_ERROR,
"failed to extract disk layout");
goto err;
}
ret = dict_set_bin (xattr, "trusted.glusterfs.dht",
disk_layout, 4 * 4);
if (ret == -1) {
gf_log (this->name, GF_LOG_ERROR,
"failed to set xattr dictionary");
goto err;
}
disk_layout = NULL;
gf_log (this->name, GF_LOG_DEBUG,
"setting hash range %u - %u (type %d) on subvolume %s for %s",
layout->list[i].start, layout->list[i].stop,
layout->type, subvol->name, loc->path);
dict_ref (xattr);
STACK_WIND (frame, dht_selfheal_dir_xattr_cbk,
subvol, subvol->fops->setxattr,
loc, xattr, 0);
dict_unref (xattr);
return 0;
err:
if (xattr)
dict_destroy (xattr);
if (disk_layout)
FREE (disk_layout);
dht_selfheal_dir_xattr_cbk (frame, subvol, frame->this,
-1, ENOMEM);
return 0;
}
int
dht_selfheal_dir_xattr (call_frame_t *frame, loc_t *loc, dht_layout_t *layout)
{
dht_local_t *local = NULL;
int missing_xattr = 0;
int i = 0;
int ret = 0;
xlator_t *this = NULL;
local = frame->local;
this = frame->this;
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].err != -1 || !layout->list[i].stop) {
/* err != -1 would mean xattr present on the directory
* or the directory is itself non existant.
* !layout->list[i].stop would mean layout absent
*/
continue;
}
missing_xattr++;
}
gf_log (this->name, GF_LOG_DEBUG,
"%d subvolumes missing xattr for %s",
missing_xattr, loc->path);
if (missing_xattr == 0) {
dht_selfheal_dir_finish (frame, this, 0);
return 0;
}
local->call_cnt = missing_xattr;
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].err != -1 || !layout->list[i].stop)
continue;
ret = dht_selfheal_dir_xattr_persubvol (frame, loc, layout, i);
if (--missing_xattr == 0)
break;
}
return 0;
}
int
dht_selfheal_dir_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno,
inode_t *inode, struct stat *stbuf)
{
dht_local_t *local = NULL;
dht_layout_t *layout = NULL;
call_frame_t *prev = NULL;
xlator_t *subvol = NULL;
int i = 0;
int this_call_cnt = 0;
local = frame->local;
layout = local->selfheal.layout;
prev = cookie;
subvol = prev->this;
if ((op_ret == 0) || (op_errno == EEXIST)) {
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].xlator == subvol) {
layout->list[i].err = -1;
break;
}
}
}
this_call_cnt = dht_frame_return (frame);
if (is_last_call (this_call_cnt)) {
dht_selfheal_dir_xattr (frame, &local->loc, layout);
}
return 0;
}
int
dht_selfheal_dir_mkdir (call_frame_t *frame, loc_t *loc,
dht_layout_t *layout, int force)
{
int missing_dirs = 0;
int i = 0;
dht_local_t *local = NULL;
xlator_t *this = NULL;
local = frame->local;
this = frame->this;
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].err == ENOENT || force)
missing_dirs++;
}
if (missing_dirs == 0) {
dht_selfheal_dir_xattr (frame, loc, layout);
return 0;
}
local->call_cnt = missing_dirs;
for (i = 0; i < layout->cnt; i++) {
if (layout->list[i].err == ENOENT || force) {
gf_log (this->name, GF_LOG_DEBUG,
"creating directory %s on subvol %s",
loc->path, layout->list[i].xlator->name);
STACK_WIND (frame, dht_selfheal_dir_mkdir_cbk,
layout->list[i].xlator,
layout->list[i].xlator->fops->mkdir,
loc, local->stbuf.st_mode);
}
}
return 0;
}
void
dht_selfheal_layout_new_directory (call_frame_t *frame, loc_t *loc,
dht_layout_t *layout)
{
dht_conf_t *conf = NULL;
xlator_t *this = NULL;
uint32_t chunk = 0;
int i = 0;
uint32_t start = 0;
int cnt = 0;
int err = 0;
this = frame->this;
conf = this->private;
for (i = 0; i < layout->cnt; i++) {
err = layout->list[i].err;
if (err == -1 || err == 0) {
layout->list[i].err = -1;
cnt++;
}
}
/* no subvolume has enough space, but can't stop directory creation */
if (!cnt) {
for (i = 0; i < layout->cnt; i++) {
err = layout->list[i].err;
if (err == ENOSPC) {
layout->list[i].err = -1;
cnt++;
}
}
}
chunk = ((unsigned long) 0xffffffff) / cnt;
start = 0;
for (i = 0; i < layout->cnt; i++) {
err = layout->list[i].err;
if (err == -1) {
layout->list[i].start = start;
layout->list[i].stop = start + chunk - 1;
start = start + chunk;
gf_log (this->name, GF_LOG_DEBUG,
"gave fix: %u - %u on %s for %s",
layout->list[i].start, layout->list[i].stop,
layout->list[i].xlator->name, loc->path);
if (--cnt == 0) {
layout->list[i].stop = 0xffffffff;
break;
}
}
}
}
int
dht_selfheal_dir_getafix (call_frame_t *frame, loc_t *loc,
dht_layout_t *layout)
{
dht_conf_t *conf = NULL;
xlator_t *this = NULL;
dht_local_t *local = NULL;
int missing = -1;
int down = -1;
int holes = -1;
int ret = -1;
int i = -1;
int overlaps = -1;
this = frame->this;
conf = this->private;
local = frame->local;
missing = local->selfheal.missing;
down = local->selfheal.down;
holes = local->selfheal.hole_cnt;
overlaps = local->selfheal.overlaps_cnt;
if ((missing + down) == conf->subvolume_cnt) {
dht_selfheal_layout_new_directory (frame, loc, layout);
ret = 0;
}
if (holes <= down) {
/* the down subvol might fill up the holes */
ret = 0;
}
if (holes || missing || overlaps) {
dht_selfheal_layout_new_directory (frame, loc, layout);
ret = 0;
}
for (i = 0; i < layout->cnt; i++) {
/* directory not present */
if (layout->list[i].err == ENOENT) {
ret = 0;
break;
}
}
/* TODO: give a fix to these non-virgins */
return ret;
}
int
dht_selfheal_new_directory (call_frame_t *frame,
dht_selfheal_dir_cbk_t dir_cbk,
dht_layout_t *layout)
{
dht_local_t *local = NULL;
local = frame->local;
local->selfheal.dir_cbk = dir_cbk;
local->selfheal.layout = layout;
dht_layout_sort_volname (layout);
dht_selfheal_layout_new_directory (frame, &local->loc, layout);
dht_selfheal_dir_xattr (frame, &local->loc, layout);
return 0;
}
int
dht_selfheal_directory (call_frame_t *frame, dht_selfheal_dir_cbk_t dir_cbk,
loc_t *loc, dht_layout_t *layout)
{
dht_local_t *local = NULL;
uint32_t holes = 0;
uint32_t overlaps = 0;
uint32_t missing = 0;
uint32_t down = 0;
uint32_t misc = 0;
int ret = 0;
xlator_t *this = NULL;
local = frame->local;
this = frame->this;
ret = dht_layout_anomalies (this, loc, layout,
&local->selfheal.hole_cnt,
&local->selfheal.overlaps_cnt,
&local->selfheal.missing,
&local->selfheal.down,
&local->selfheal.misc);
holes = local->selfheal.hole_cnt;
overlaps = local->selfheal.overlaps_cnt;
missing = local->selfheal.missing;
down = local->selfheal.down;
misc = local->selfheal.misc;
local->selfheal.dir_cbk = dir_cbk;
local->selfheal.layout = layout;
if (down) {
gf_log (this->name, GF_LOG_ERROR,
"%d subvolumes down -- not fixing", down);
ret = 0;
goto sorry_no_fix;
}
if (misc) {
gf_log (this->name, GF_LOG_ERROR,
"%d subvolumes have unrecoverable errors", misc);
ret = 0;
goto sorry_no_fix;
}
dht_layout_sort_volname (layout);
ret = dht_selfheal_dir_getafix (frame, loc, layout);
if (ret == -1) {
gf_log (this->name, GF_LOG_ERROR,
"not able to form layout for the directory");
goto sorry_no_fix;
}
dht_selfheal_dir_mkdir (frame, loc, layout, 0);
return 0;
sorry_no_fix:
/* TODO: need to put appropriate local->op_errno */
dht_selfheal_dir_finish (frame, this, ret);
return 0;
}
int
dht_selfheal_restore (call_frame_t *frame, dht_selfheal_dir_cbk_t dir_cbk,
loc_t *loc, dht_layout_t *layout)
{
int ret = 0;
dht_local_t *local = NULL;
local = frame->local;
local->selfheal.dir_cbk = dir_cbk;
local->selfheal.layout = layout;
ret = dht_selfheal_dir_mkdir (frame, loc, layout, 1);
return 0;
}
|